Can I use this new Roku soundbar device for Meta or Google or Zoom video chatting? Does the device have a camera?
No and there's no way to connect a camera.
There are no Meta or Google or Zoom apps, so you'd be limited to mirroring from another device (PC/Phone/Tablet) if you want the audio/video from that device to be seen/heard through your TV/AVR (not recommended due to performance/stability/latency issues).
For casting/mirroring Roku supports the following protocols: DIAL (casting), Miracast (mirroring), AirPlay (casting/mirroring), and ECP/Play on Roku (casting).
If you do wish to pursue this method, you might consider an Android TV based streamer device - they have built-in ChromeCast/GoogleCast protocol compatibility and may perform better when casting/mirroring.